There is a limit of 200 receipients that can be included in a payout, hence the min payout set on the pool. If payments stop going out, do not worry! Funds are safu! Blocks can still be found and will be credited to your username!

The longer it takes to make a payout, the more people meet the min payout making the following payout take longer. If you scroll down the payments page compare the number of miners paid versus the time between payments and you will see the correlation.

Pending is supposed to be time to maturity before a block gets paid which is set to 10 to try to coincide with dPoW (notarization of blocks)

Immature and balance on your worker stats page are the unpaid balances accrued from previous payout rounds, it does not count blocks that have not yet been attempted to be paid by the pool

Payments that show up on the payments page initially are in the process of constructing the z transaction, once it actually broadcasts the transaction it will switch to being hyperlinked and then should arrive in miners' wallets in the next block or two.